1. Singhal, A.: Introducing the Knowledge Graph: Things, Not Strings. Google Official Blog (2012). Accessed 10 Dec 2017
2. Casey Newton: Google’s Knowledge Graph tripled in size in seven months. CNET. CBS Interactive (2012). Accessed 10 Dec 2017
3. Nadeau, D., Sekine, S.: A survey of named entity recognition and classification. Lingvisticae Investigationes (2007)
4. Sang, T.K., Erik, F., De Meulder, F.: Introduction to the CoNLL-2003 shared task: language-independent named entity recognition, CoNLL (2003)
5. Ritter, A., Clark, S., Mausam, Etzioni, O.: Named entity recognition in tweets: an experimental study. In: Proceeding of Empirical Methods in Natural Language Processing (2011)